Here answer is vander waal strain . Plz explain how . Also if vanderwaal strain is the answr then what is significanceof torsional strain

Dear student
Please find the solution to the asked query:

a)Less stable staggered form of butane refers to the gauche conformation:

Vander waal strain is also called flag-pole interaction that is present in boat form. This arises when the hydrogen come closer to each other in the boat conformation.
This is thus responsible for the less stability of the staggered form
Tortional strain is the intramolecular strain present due to repulsion between two eclipsed atoms or groups.
Tortional strain is more in eclipsed conformation due to the proximity of the adjacent H atoms


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